SN2017jgh: a high-cadence complete shock cooling light curve of a SN IIb with the Kepler telescope

Armstrong, P. and Tucker, B. E. and Rest, A. and Ridden-Harper, R. and Zenati, Y. and Piro, A. L. and Hinton, S. and Lidman, C. and Margheim, S. and Narayan, G. and Shaya, E. and Garnavich, P. and Kasen, D. and Villar, V. and Zenteno, A. and Arcavi, I and Drout, M. and Foley, R. J. and Wheeler, J. and Anais, J. and Campillay, A. and Coulter, D. and Dimitriadis, G. and Jones, D. and Kilpatrick, C. D. and Munoz-Elgueta, N. and Rojas-Bravo, C. and Vargas-Gonzalez, J. and Bulger, J. and Chambers, K. and Huber, M. and Lowe, T. and Magnier, E. and Shappee, B. J. and Smartt, S. and Smith, K. W. and Barclay, T. and Barentsen, G. and Dotson, J. and Gully-Santiago, M. and Hedges, C. and Howell, S. and Cody, A. and Auchettl, K. and Bodi, A. and Bognar, Zs and Brimacombe, J. and Brown, P. and Cseh, B. and Galbany, L. and Hiramatsu, D. and Holoien, T. W-S and Howell, D. Andrew and Jha, S. W. and Konyves-Toth, R. and Kriskovics, L. and McCully, C. and Milne, P. and Munoz, J. and Pan, Y. and Pal, A. and Sai, H. and Sarneczky, K. and Smith, N. and Sodor, A. and Szabo, R. and Szakats, R. and Valenti, S. and Vinko, J. and Wang, X. and Zhang, K. and Zsidi, G. (2021) SN2017jgh: a high-cadence complete shock cooling light curve of a SN IIb with the Kepler telescope. Monthly Notices of the Royal Astronomical Society, 507 (3). pp. 3125-3138. ISSN 0035-8711

Abstract

SN 2017jgh is a type IIb supernova discovered by Pan-STARRS during the C16/C17 campaigns of the Kepler/K2 mission. Here, we present the Kepler/K2 and ground based observations of SN 2017jgh, which captured the shock cooling of the progenitor shock breakout with an unprecedented cadence. This event presents a unique opportunity to investigate the progenitors of stripped envelope supernovae. By fitting analytical models to the SN 2017jgh light curve, we find that the progenitor of SN 2017jgh was likely a yellow supergiant with an envelope radius of ∼ 50-290R⊙, and an envelope mass of ∼ 0-1.7M⊙. SN 2017jgh likely had a shock velocity of ∼7500-10 300 km s-1. Additionally, we use the light curve of SN 2017jgh to investigate how early observations of the rise contribute to constraints on progenitor models. Fitting just the ground based observations, we find an envelope radius of ∼ 50-330R⊙, an envelope mass of ∼ 0.3-1.7M⊙ and a shock velocity of ∼9000-15 000 km s-1. Without the rise, the explosion time cannot be well constrained that leads to a systematic offset in the velocity parameter and larger uncertainties in the mass and radius. Therefore, it is likely that progenitor property estimates through these models may have larger systematic uncertainties than previously calculated.